MongoDB C100DBA Exam Practice Test Instant Access

Question 1

Suposse tou have the following collection with only 2 documents:

If you run an aggregation query and use { $unwind: "$traits" } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?

Answer : B

Question 2

The MongoDB explain() method does not support which of the following verbosity mode:

AexecutionStats

BqueryPlanner

CcustomExecutionStats

DallPlansExecution

Answer : A

Question 3

The MongoDB explain() method does not support which of the following verbosity mode:

AexecutionStats

BqueryPlanner

CcustomExecutionStats

DallPlansExecution

Answer : C

Question 4

What is the equivalent command in MongoDB for the following SQL query?

SELECT * FROM posts WHERE author like "%john%"

Adb.posts.find( { author: /John/ } )

Bdb.posts.find( { author: /AjohnA/ > )

Cdb.posts.find( { $like: {author: /John/} } )

Ddb.posts.find( { author: {$like: /John/} } )

Answer : A

Question 5

Which of the following about Capped Collections is correct?

AFixed Size

BOnly 'Fixed Size' and 'High-throughput operations that insert and retrieve documents based on insertion order'

CHigh-throughput operations that insert and retrieve documents based on insertion order

DIf the allocated space for a capped collection exceeds, it stops inserting new documents

Answer : B

Question 6

Which of the following aggregation commands in MongoDB does not support sharded collections?

AmapReduce

Bgroup

Caggregate

DAll of the above

Answer : B

Question 7

What does the following query do when performed on the posts collection? db.posts.update({_id:l},{Title:This is post with ID 1"})

ASyntax error

BReplaces the complete document with _id as 1 with the document specified in second parameter

CUpdates the Title of the post

DUpdating a document is possible only with $set

Answer : B

MongoDB C100DBA MongoDB Certified DBA Associate Exam Practice Test